<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table
                :data="rolesList"
                v-loading="loading"
                border
                stripe
            >
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row
                            :class="['vcenter','bdbottom',i1==0?'bdtop':'']"
                            v-for="(item1,i1) in scope.row.children"
                            :key="i1"
                        >
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag
                                    closable
                                    @close="removeRightById(scope.row,item1.id)"
                                >{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <el-row
                                    :class="[i2==0?'':'bdtop','vcenter']"
                                    v-for="(item2,i2) in item1.children"
                                    :key="i2"
                                >
                                    <!-- 渲染二级权限 -->
                                    <el-col :span="6">
                                        <el-tag
                                            type="success"
                                            closable
                                            @close="removeRightById(scope.row,item2.id)"
                                        >{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <!-- 渲染三级权限 -->
                                    <el-col :span="18">
                                        <el-tag
                                            type="warning"
                                            closable
                                            v-for="(item3,i3) in item2.children"
                                            :key='i3'
                                            @close="removeRightById(scope.row,item3.id)"
                                        >{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column
                    label="#"
                    type="index"
                ></el-table-column>
                <el-table-column
                    label="角色名称"
                    prop="roleName"
                ></el-table-column>
                <el-table-column
                    label="角色描述"
                    prop="roleDesc"
                ></el-table-column>
                <el-table-column
                    label="操作"
                    width="340px"
                >
                    <template slot-scope="scope">
                        <el-button
                            type="primary"
                            icon="el-icon-edit"
                            size="medium"
                        >编辑</el-button>
                        <el-button
                            type="danger"
                            icon="el-icon-delete"
                            size="medium"
                        >删除</el-button>
                        <el-button
                            type="warning"
                            icon="el-icon-setting"
                            size="medium"
                            @click="showSetRightDialog(scope.row)"
                        >分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%"
            @close="setRgithDialogClosed"
        >
            <!-- 树形控件 -->
            <el-tree
                ref="treeRef"
                :data="rightsList"
                :props="treeProps"
                show-checkbox
                node-key="id"
                default-expand-all
                :default-checked-keys="defKeys"
            ></el-tree>
            <span
                slot="footer"
                class="dialog-footer"
            >
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button
                    type="primary"
                    @click="allotRights"
                >确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data () {
        return {
            loading: false,
            // 所有角色列表数据
            rolesList: [],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 所有权限数据
            rightsList: [],
            // 树形控件的属性绑定对象
            treeProps: {
                label: 'authName',
                children: 'children'
            },
            // 默认选中的节点ID值数组
            defKeys: [],
            // 即将分配权限的ID
            roleId: ''
        }
    },
    created () {
        this.getRolesList()
    },
    methods: {
        // 获取所有角色列表
        getRolesList () {
            this.loading = true
            this.$request.get('roles').then(res => {
                this.loading = false
                this.rolesList = res
            }).catch(res => {
                this.loading = false
                this.$message.error('获取角色列表失败！')
            })
        },
        // 根据Id删除对应的权限
        removeRightById (role, id) {
            // 弹窗提示用户是否删除
            this.$messageBox.confirm('此操作将永久删除该用户权限, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).then(() => {
                this.$request.delete(`roles/${role.id}/rights/${id}`).then(res => {
                    this.$message.success('删除用户权限成功！')
                    role.children = res
                }).catch(res => {
                    this.$message.error('删除用户权限失败！')
                })
            }).catch(() => {
                this.$message.info('已取消删除')
            })
        },
        // 展示分配权限的对话框
        showSetRightDialog (role) {
            this.roleId = role.id
            // 获取所有权限的数据
            this.$request.get('rights/tree').then(res => {
                this.rightsList = res
                // 递归获取三级节点id
                this.getLeafKeys(role, this.defKeys)
                this.setRightDialogVisible = true
            }).catch(res => {
                this.$message.error('获取权限数据失败！')
            })
        },
        // 通过递归的形式，获取角色下的三级权限
        getLeafKeys (node, arr) {
            // 如果当前 node 节点不包含 children 属性，则是三级节点
            if (!node.children) {
                return arr.push(node.id)
            }
            node.children.forEach(item => {
                this.getLeafKeys(item, arr)
            })
        },
        // 监听分配权限对话框的隐藏
        setRgithDialogClosed () {
            this.defKeys = []
        },
        // 点击为角色分配权限
        allotRights () {
            const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()]
            const idStr = keys.join(',')
            this.$request.post(`roles/${this.roleId}/rights`, {
                rids: idStr
            }).then(res => {
                this.$message.success('分配权限成功！')
                this.getRolesList()
                this.setRightDialogVisible = false
            }).catch(res => {
                this.$message.error('分配权限失败！')
            })
        }
    }
}
</script>

<style lang="less" scoped>
.el-tag {
    margin: 7px;
}

.bdtop {
    border-top: 1px solid #eee;
}

.bdbottom {
    border-bottom: 1px solid #eee;
}

.vcenter {
    display: flex;
    align-items: center;
}
</style>
